Information about my Munin Server

[root@munin ~]# ip a | grep inet
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
inet 192.168.2.98/24 brd 192.168.2.255 scope global noprefixroute dynamic enp0s3
inet6 2a02:a455:37bd:1:e01f:6f17:6209:5424/64 scope global noprefixroute dynamic
inet6 fe80::14a3:f26a:e5d2:e74e/64 scope link noprefixroute
[root@munin ~]# uname -a
Linux munin.osradar.lan 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
[root@munin ~]# cat /etc/centos-release
CentOS Linux release 7.6.1810 (Core)
[root@munin ~]#

1-update ur  Server

For Centos  /RHEL Servers

yum update -y

For  Fedora 28/29

dnf update -y

# yum update
2. Install the EPEL repository
How to install the EPEL repository on Centos7 or Fedora 29:

# yum install epel-release -y
# dnf install epel-release  -y

3. Install Munin and Apache
How to install Install Munin and Apache  in Centos and Fedora

Please use the below command:

# yum install   munin munin-node httpd -y
# dnf install   munin munin-node httpd -y

Here bellow you  find related munin files and  directories

• /etc/munin/munin.conf : Munin master configuration file.
• /etc/cron.d/munin : Munin cron file.
• /etc/httpd/conf.d/munin.conf : Munin Apache configuration file.
• /var/log/munin : Munin log directory.
• /var/www/html/munin : Munin web directory.
• /etc/munin/munin-node.conf : Munin Node master configuration file.
• /etc/munin/plugins.conf : Munin plugins configuration file.

4. Install  and Configure Munin

Now   enable and , start Munin  on boot.

# systemctl enable munin-node
# systemctl start munin-node

5.Configuration

Edit file /etc/httpd/conf.d/munin.conf,

# vi /etc/munin/munin.conf

Add/Edit as shown below.

#Uncomment the following lines
dbdir   /var/lib/munin
htmldir /var/www/html/munin
logdir /var/log/munin
rundir  /var/run/munin

[...]

# a simple host tree. Set your system name
[munin.osradar.lan]
address 127.0.0.1
use_node_name yes

Setup Apache  to be accessible from the local network

Edit file /etc/httpd/conf.d/munin.conf,

# vi /etc/httpd/conf.d/munin.conf

Add the following lines at the end.

<Directory /var/www/html/munin/>
Order Deny,Allow
Deny from all
Allow from 127.0.0.1 192.168.2.0/24
</Directory>

6. Configure Munin master user
Use the htpasswd utility to  create a username and password for basic authentication,

lets make osradar user be able to access the site

# htpasswd /etc/munin/munin-htpasswd  osradar
New password:
Re-type new password:

The  HTTP munin configuration will be  like this

#cat /etc/httpd/conf.d/munin.conf

<Directory /var/www/html/munin/>

AuthUserFile /etc/munin/munin-htpasswd
AuthName "osradar"
AuthType Basic
require valid-user

Order Deny,Allow
Deny from all
Allow from 127.0.0.1 192.168.2.0/24
</Directory>

7.Restart apache

Check if  any warnings of errors displaying.

# systemctl restart httpd

7.1-Configure the fireWall

allow connection to port 80  ( http service)

[root@munin ~]# firewall-cmd --permanent --add-service=http
success
[root@munin ~]# firewall-cmd --reload
success
[root@munin ~]#

8.Try access  the  Server  http://host/munin

How to add Monitoring Client  to Munin

My Cllient is Centos server with ip adress : 192.168.2.165  and hostname  osradarClient

Go to your client systems and install munin-node package.

#yum  update
yum  install  epel-release
# yum install munin-node -y

Configure the node

Edit file /etc/munin/munin-node.conf,

# vi /etc/munin/munin-node.conf
Set client hostname and specify Munin server IP address.

[...]
host_name osradarClient

[...]

allow ^192\.168\.2\.98$
allow ^::1$

[...]

osradarClient is my client hostname and 192.168.2.98 is my Munin server.

Start and  enable  munin-node service on your client system.

# systemctl enable munin-node 
# systemctl start munin-node

Back to  your Munin server and add the client system host name and ip address in /etc/munin/munin.conf file

# vi /etc/munin/munin.conf
Add the following lines.

[osradarClient]
address 192.168.2.165
use_node_name yes

Save and exit .

Very  important   :

To fetch data from clients. the firewall port  4949 should be  open

 [root@osradarClient ~]# firewall-cmd --permanent --add-port=4949/tcp
success
[root@osradarClient ~]# firewall-cmd --reload
success

Check the logs on the Munin Server /var/log/munin

You  have to wait some minutes to build data  before to be pushed to the graphs

Please  Enjoy

Enjoy

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